Jonathan R. Goodman is a social scientist based at the Wellcome Sanger Institute and Cambridge Public Health, University of Cambridge. He writes about trust, inequality, and evolutionary theory for publications including the Financial Times, New Scientist, Nature, The Guardian, and Scientific American. He lives in London, UK. Robert A. Foley is emeritus professor of human evolution at the University of Cambridge, a senior fellow of King's College, Cambridge, a fellow of the Alan Turing Institute, and a fellow of the British Academy. He is based in Cambridge, UK.